Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7330eb0080806f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 20:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f33ef28c15493205f5ea91448b97a618 SHA-1: b4752a2e11c01c75ff368e46276d7e54cee23214 SHA-256: 4f7330eb0080806fc90f3b4b75c6347c3b3bdf286f1e96efd99eb56c3f848185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://redac.ch/upload/vemivamoxadafosanal.pdf In PDF document text
    • http://j-club.eu/userfiles/file/7385542106.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/lunaxezarusapik.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/43610386467.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/vedesemudaxo.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/38953565539.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jspj4afr3gb049jtses0804j10/gomeseviwug.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16138c20c15e0a---tejelemobevaratasu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131269b7e806---98133706016.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jorumebawejupu.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/paduwato.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/daposobevilevelu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909011528964786.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/godubenukukepubonot.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tevujab.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/jukiridovinaxuragepobufur.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/60308435982.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/puverunibotipeba.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/91988061733.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/6441516481.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/tazabefakujegesufagelawex.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/sepodibitezululo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zosegetojixigum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quickshortcutmaker+old+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 18308 bytes
SHA-256: 4176851d7ec04533d4eeb17e6d0983bc9c6aeab6fba82e9b38f443bbb2664dd3
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10952 bytes
SHA-256: dc52dbab4bd87ddce56fb8d6076866870ace367603ec34746bc85ba5fe6ab0f9